﻿/* Copyright © 2013-2014 Managing Infrastructure Information Ltd
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 * following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and 
 * the following disclaimer in the documentation and/or other materials provided with the distribution.
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 * 3. Neither the name Managing Infrastructure Information Ltd (MIIL) nor the names of its contributors may 
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 * permission.
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using System;
using System.Globalization;
using System.Windows.Data;

namespace AbsyntaxExcelAddIn.Core.Converters
{
    /// <summary>
    /// Abstract base class for converters that convert objects to <see cref="System.Uri"/> instances 
    /// pointing to PNG image files.
    /// </summary>
    public abstract class PngUriConverterBase : IValueConverter
    {
        protected PngUriConverterBase()
        { }

        /// <summary>
        /// Uses a supplied file name to create a Uri instance defining a path to A PNG image.
        /// </summary>
        /// <param name="fileName">The name of the target image file, excluding extension and path.</param>
        /// <returns>A new Uri instance.</returns>
        protected Uri Create(string fileName)
        {
            return fileName == null ? null : new Uri(String.Format(
                "pack://application:,,,/AbsyntaxExcelAddIn.Core;component/Images/{0}.png", fileName));
        }

        public abstract object Convert(object value, Type targetType, object parameter, CultureInfo culture);

        public abstract object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture);
    }
}